Micrometer-gage



(No Model'j l f. H. EMERY.

MIGBOMETER GAGE.

Patented Apr. 12, 1887.

VFl 'G m FIGJ- UNITED STATES PATENT Cri-Fien.

ALBERT H. EMERY, OF STAMFORD, CONNECTICUT.

MICRoMl-:TER-GAGE.

SPECIFICATION forming part of Letters Patent No. 361,055, dated April 12, 182.7,

' Application filed April 20, 1886. ASerial No. 199,545. (No model.)

conductor of heat, so that the heat from the' hand may not be communicated to the metal of which the gage is composed; and, further,to connecting the handle or holding-pieces to the body of the gage by pins or fastenings of a material non-conductive of heat, as hereinafter explained.

The invention further relates to means for adjusting the nut or screw socket on the -mi,

, crometer-screw, so as to adapt the latter to work and measure with great accuracy, and to take up or compensate for any wear between the parts; also, to provisions for readily fixing the gage at any measurement to which it may be set. To these ends I construct the screwsocket with .a transverse slit extending on both sides of the micrometer-screw, and the setscrews by which the screw-socket is adjusted to the said micrometer-screw, and I provide, in

addition to said set-screws,by which the parts are'kept in the required adjustment to adapt them to work accurately together, a lockingscrew, by whieh,without interfering with the set-screws, the nut or screw-socket may, when desired,beclampeduponthemicrometer-screw, so as to lock the same and prevent its motion, and thus retain the gage at any adjustment to which it may be set.

The invention further relates to the provision -ofv'screw-legs of different lengths, constituting same. Fig. III is a longitudinal section thereof on the line III III, Fig. I. Fig. IV is a view of an extension-leg.

To the body 1 of the gage I attach a holding- *piece or handle, 2, bymeans of pins 3, the handle 2 and pins 3 being made of boxwood or other material which is a poor conductor of heat, so that in using the gage its length may not be materially changed bythe communication of heat from the hand to the metal of which it is composed.

A deep slit, 1"', divides the body of the gageV into two parts, 4 5, the former constituting the screw socket or nut ofthe micrometer-screw 6, and the latter a screw-socket or nut for the reception of a screw, 9, forming the foot of the gage. The longitudinal slit shown in Figs. II and III and the transverse slit lu (shown in Figs. I and III) permit the independent con traction and expansion of the screw-sockets 4 Atheir faces carefully and accurately ground.

The footscrew 9 aifords,as already explained, means for the setting of the instrument to a determinate gage length while the micrometer is at zero, and the s aid screw is fixed in its adjustment by set-screws l1, securely clamping the nut or screw-socket 5 upon it. Set` screws 10 are employed to adjust the screwsocket 4 to fit the micrometer-screw 6, which works therein. In addition to these a lockingscrew, 12, is provided, having a milled head for convenience of manipulation,and employed to fix the micrometer-screw 6 immovabl y at any gage length or release it at will without disturbing the adjustment of the set-screws l0.

It will be apparent that after the'screws 10 have been adjusted to fit the screw-socketet as tightly as desired to the micrometer-screw 6 the said socket may be still further contracted IOO by means of the thumbscrew 12 to lock the micrometer-screw 6 Wherever it is set, the upper member of the split socket being temporarily carried away from the heads ofthe screws 10, and coming against them again when released by moving back the locking-screw 12.

For the extension of the gage to greater lengths, any desirable number ofadditional legs 13 are provided, said extensionlegs being of different determinate lengths, to be inserted in the socket 5 in place ofthe foot-screw 9, and having an accurately-grouml end to form the gagingfoot ofthe instrument.

Inl using the device last described the footscrew 9 is taken out and an extension screwleg, 13, of the required length inserted in its place in the socket 5, said extension-leg 13 being screwed in to an accurate determinate length while the micrometer-screw Gis at zero, and there fixed by means of the set-screws 11, as already described with reference to the adjustable footscrew 9.

The removable screw S, forming the head of a gage for internal measurements, I vhave described and claimed in another application of even date herewith, numbered 199,516, and designated fase B.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

1. A micrometer -gage having the nut or screw-socket in which the micrometer-screw Works split on both sides of said screw, in Combination with a screw or screws for adjusting the socket to fit the micrometer-screw, and a separate loeki ngserew,by which the micrometerserew may be fixed in any position to which it is set.

2. rlhe combination of the body 1, having sockets 4 and 5, the micrometer-screw G, sleeve or cap 7, gage-head 8, set-screws 11, and intel changeable screw-legs, substantially as and for the purpose set forth.

3. A micrometer-gage having a frame split longitudinally and transversely to provide i11- dependently-adjustable screwsockets, separate gagelscrews in said sockets, and set-screws by means of which the said gage-screws can be locked or released independently, as explained.

ALBERT H. EMERY. Vitnesses:

Ocmvlus KNIGHT, F. A. HorKiNs. 

